It shouldn't be an issue.
However, I heard from someone I met at the WLR who attended a sales pitch that if you now purchase WLR Platinum Plus (from Starwood), you cannot book the last two weeks. I don't know if this is actually true, an inaccurate interpretation of what this person heard, or what. Or perhaps this was their way to encourage someone to purchase event weeks? I don't know. If this IS true, this is a change in terms. Has anyone else heard something like this? Once again, could be false and just this person's misinterpretation of what they heard the salesperson say, or the salesperson provided erroneous information.
What I do know is that I own Platinum Plus (float), which I got as a resale, and I have no such restrictions. I have successfully booked the last week of December and Christmas week, without any issues.